residential smoke detector; smoke alarm
A fire alarm device designed for home use, as opposed to commercial or industrial settings. Often required by law in Japanese residences.
See also: 火災警報器 (かさいけいほうき)
Residential smoke detectors are required to be installed in bedrooms and at the top of stairs.
This residential smoke alarm is battery-operated and easy to install.
Compound of 住宅用 (residential) + 火災 (fire) + 警報器 (alarm device).